Add patch to fix ext4 compatibility with ext2 mount option (rhbz 770172)

1 files changed, 51 insertions, 0 deletions

diff --git a/ext4-Support-check-none-nocheck-mount-options.patch b/ext4-Support-check-none-nocheck-mount-options.patch
new file mode 100644
index 000000000..281e4237a
--- /dev/null
+++ b/ext4-Support-check-none-nocheck-mount-options.patch
@@ -0,0 +1,51 @@
+From ea75f7357e3a881bd1bd0db5e483fc6a8681567b Mon Sep 17 00:00:00 2001
+From: Josh Boyer <jwboyer@redhat.com>
+Date: Tue, 10 Jan 2012 09:39:02 -0500
+Subject: [PATCH] ext4: Support "check=none" "nocheck" mount options
+
+The ext2/ext3 filesystems supported "check=none" and "nocheck" as mount options
+even though that was already the default behavior and it essentially did
+nothing.  When using ext4 to mount ext2/ext3 filesystems, that mount option
+causes the mount to fail.  That isn't as backward compatible as it could be,
+so add support to ext4 to accept the option.
+
+Signed-off-by: Josh Boyer <jwboyer@redhat.com>
+---
+ fs/ext4/super.c |    7 ++++++-
+ 1 files changed, 6 insertions(+), 1 deletions(-)
+
+diff --git a/fs/ext4/super.c b/fs/ext4/super.c
+index 3e1329e..5ff09e7 100644
+--- a/fs/ext4/super.c
++++ b/fs/ext4/super.c
+@@ -1333,7 +1333,7 @@ enum {
+ 	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
+ 	Opt_inode_readahead_blks, Opt_journal_ioprio,
+ 	Opt_dioread_nolock, Opt_dioread_lock,
+-	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
++	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, Opt_nocheck,
+ };
+ 
+ static const match_table_t tokens = {
+@@ -1409,6 +1409,8 @@ static const match_table_t tokens = {
+ 	{Opt_init_itable, "init_itable=%u"},
+ 	{Opt_init_itable, "init_itable"},
+ 	{Opt_noinit_itable, "noinit_itable"},
++	{Opt_nocheck, "check=none"},
++	{Opt_nocheck, "nocheck"},
+ 	{Opt_err, NULL},
+ };
+ 
+@@ -1905,6 +1907,9 @@ set_qf_format:
+ 		case Opt_noinit_itable:
+ 			clear_opt(sb, INIT_INODE_TABLE);
+ 			break;
++		case Opt_nocheck:
++			/* ext2/ext3 used to "support" this option.  Silently eat it */
++			break;
+ 		default:
+ 			ext4_msg(sb, KERN_ERR,
+ 			       "Unrecognized mount option \"%s\" "
+-- 
+1.7.7.5
+